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Water and nitrogen (N) interact to influence soil N cycling and plant N acquisition. We studied N relations of trees across a 1000 km gradient, from wet monsoonal savanna dominated by Eucalyptus to semi-arid woodland dominated by N-fixing Acacia. Based on N stable isotopes and soil N measurements, we concluded that trees shifted from N limitation to water limitation along the gradient. We also found that xylem stable isotope measurements were a much more sensitive indicator of N fixation than more commonly used leaf measurements.
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This page is a summary of: Natural abundance (δ15N) indicates shifts in nitrogen relations of woody taxa along a savanna–woodland continental rainfall gradient, Oecologia, December 2014, Springer Science + Business Media,
DOI: 10.1007/s00442-014-3176-3.
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